TAILIEUCHUNG - Determination of natural radioactivity in soil samples around gold mining area in Khamkeut district, Bolikhamxay province,Laos using gamma ray spectrometer with NaI (Tl) detector

This paper presented the method of determining the radioactivity of 40K, 226Ra and 232Th in soil samples by gamma-ray spectrometerusing NaI (Tl) scintillation detector. The radioactivity of each isotope is calculated based on the net count rate in the energy window characteristics for the 40K, 226Ra and 232Th radioisotopes respectively. | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 3 (2018) 12-21 Determination of Natural Radioactivity in Soil Samples around Gold Mining Area in Khamkeut District, Bolikhamxay Province,Laos Using Gamma Ray Spectrometer with NaI (Tl) Detector Somsavath Leuangtakoun1,2, Bui Thi Hong1, Bui Van Loat1,*, Phan Viet Cuong3 1 Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam 2 National University of Laos, : 7322, Dongdo Vientiane, Laos 3 Institude of Physics, VAST, 1 DaoTan, Hanoi, Vietnam Received 15 May 2018 Revised 25 July 2018; Accepted 26 July 2018 Abstract: This paper presented the method of determining the radioactivity of 40K, 226Ra and 232Th in soil samples by gamma-ray spectrometerusing NaI (Tl) scintillation detector. The radioactivity of each isotope is calculated based on the net count rate in the energy window characteristics for the 40K, 226Ra and 232Th radioisotopes respectively. We have determined activity concentrations of the natural radionuclides 226Ra, 232Th and 40K in 15 soil samples collected around gold mines of Khamkeut district, Bolikhamxay Province, Laos. The average activity concentrations of the natural radionuclides 226Ra, 232Th and 40K are ± , ± and ± -1, respectively. The average activity concentrations of 226Ra and 232Th in this work are higher than those of Bolikhamxay Province, Laos and the world average values. The estimated average outdoor annual effective dose (E) and radium equivalent actitvity (Ra eq) are ± and ± , respectively. Keywords: Gamma-ray-spectroscopy, NaI(Tl) detector, ROI, student’s t distribution, Radiological Hazard Assessment. 1. Introduction Measurement of natural environmental radiation is very important and of particular concern to human health. The major sources radiological exposure are natural radionuclides namely 238U and 232 Th series and 40K, which occur in the earth' scrust .

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